package com.pig4cloud.pig.upload.file;

import cn.hutool.core.lang.Validator;
import com.pig4cloud.pig.common.core.exception.file.FileNameLengthLimitExceededException;
import com.pig4cloud.pig.common.core.exception.file.FileSizeLimitExceededException;
import com.pig4cloud.pig.common.core.exception.file.InvalidExtensionException;
import com.pig4cloud.pig.common.core.util.DateUtils;
import com.pig4cloud.pig.common.core.util.uuid.IdUtils;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */
public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    public static final int TYPE_SHOP_PHOTOS = 1;//头像的图片
    public static final int TYPE_EVENT_PHOTOS = 2;//事件
    public static final int TYPE_RESOURCE_PHOTOS = 3;//应急资源
    public static final int TYPE_RISK_PHOTOS = 4;//风险点
    public static final int TYPE_TROOPS_PHOTOS = 5;//图片文件夹

    private static final String SHOP_IMG_PREFIX  = "avatar/";
    private static final String EVENT_IMG_PREFIX  = "event/";
    private static final String RESOURCE_IMG_PREFIX  = "resource/";
    private static final String RISK_IMG_PREFIX  = "risk/";
    private static final String TROOPS_IMG_PREFIX  = "troops/";

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static String upload(String baseDir, MultipartFile file, Integer uploadType) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION,uploadType);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }


    /**
     * 获取  上传图片的 路径前缀
     * @param upload_type
     * @return
     */
    public static String getUploadPrefix(int upload_type){
        String prefix = null;
        switch (upload_type) {
            case TYPE_SHOP_PHOTOS:
                prefix = SHOP_IMG_PREFIX;
                break;
            case TYPE_EVENT_PHOTOS:
                prefix = EVENT_IMG_PREFIX;
                break;
            case TYPE_RESOURCE_PHOTOS:
                prefix = RESOURCE_IMG_PREFIX;
                break;
            case TYPE_RISK_PHOTOS:
                prefix = RISK_IMG_PREFIX;
                break;
            case TYPE_TROOPS_PHOTOS:
                prefix = TROOPS_IMG_PREFIX;
                break;

        }
        return prefix;
    }
    /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException 比如读写文件出错时
     * @throws InvalidExtensionException 文件校验异常
     */
    public static String upload(String baseDir, MultipartFile file, String[] allowedExtension, Integer uploadType)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException, InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }
        assertAllowed(file, allowedExtension);
        String fileName = extractFilename(file);
        String prefix = getUploadPrefix(uploadType);
        File desc = getAbsoluteFile(baseDir + "/" + prefix, fileName);
        file.transferTo(desc);
        String pathFileName = prefix + fileName;//getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static String extractFilename(MultipartFile file) {
        String extension = getExtension(file);
        return DateUtils.dateTime() + "/" + IdUtils.fastUUID() + "." + extension;
    }

    private static File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);
        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        return desc;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (Validator.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }
}
